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Wang, Fahui; Zhou, Chaoshuai; Zhang, Dan; Deng, Haoxin; Wen, Xiaoping; Chen, Guoyan
International journal of hydrogen energy, 04/2024, Volume: 63Journal Article
The laminar combustion characteristics of CH4-H2-CO-Air are studied in a constant volume combustion chamber with different hydrogen content ratios and the initial conditions of 300 K and 0.2 MPa by schlieren technology. The influence laws of flame instability are analyzed through the influence laws of hydrogen content ratio and equivalence ratio (Φ) on the fractal dimensions of the flame contour and the ratio of the total flame face cracks' lengths to the flame radius (L/R), as well as the influence laws of hydrodynamic instability and thermal-diffusive instabilities on the flames. The results show that L/R is more sensitive to flame instabilities than flame front fractal dimensions due to a wider sampling range. After R exceeds a certain value, for lean and rich combustion conditions with the same distance from the stoichiometric ratio, the L/R is greater during lean combustion, and as the equivalence ratio gradually increases from 0.6 to 1.4, the effect of increasing hydrogen content (Hydrogen mole fraction ranges from 60% to 66.67%) on flame instability gradually shifts from promotion to suppression. This study has certain reference value for the combustion application of biomass synthesis gas. •Research on flame characteristics based on flame cracks and fractal dimensions.•Recording of combustion flow fields using schlieren photography technique.•Flame cracks are more sensitive to changes in hydrogen content (in 6.67%).•Use of computer programs to accomplish flame information extraction.
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